Co-oximetry reports fractional saturation as HbO2 divided by the sum of which species?

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Multiple Choice

Co-oximetry reports fractional saturation as HbO2 divided by the sum of which species?

Explanation:
Co-oximetry expresses the fraction of all iron-containing hemoglobin that is bound to oxygen. The oxygenated form counts in the numerator, while the denominator includes all forms that can contain iron and influence oxygen carrying: oxyhemoglobin, deoxyhemoglobin, methemoglobin, and carboxyhemoglobin. Sulfhemoglobin is not included in this standard calculation. So the fractional saturation is HbO2 divided by HbO2 + Hb + MetHb + COHb.

Co-oximetry expresses the fraction of all iron-containing hemoglobin that is bound to oxygen. The oxygenated form counts in the numerator, while the denominator includes all forms that can contain iron and influence oxygen carrying: oxyhemoglobin, deoxyhemoglobin, methemoglobin, and carboxyhemoglobin. Sulfhemoglobin is not included in this standard calculation. So the fractional saturation is HbO2 divided by HbO2 + Hb + MetHb + COHb.

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